get some kitten dry food to standby for him/her, can be find easily in any petshop, or just show them the pict, this size can eat what kitten food, (Royal canin BABY cat series might have better chance, the pallet is alot smaller)
frontline is the best for fleas, but the chemical might be alittle to aggressive to kitten, my advise is (if u have that patient) pour the frontline to a bottle cup, use cotton bud and soak the frontline and pin point the fleas with it, instant kill, aware of their cheek and under tail, those spot are fleas favorite.

vaccination is a great choice to prevent ur kitty from unnecessary deadly disease, vaccination can be perform around 3 months old (human time)
4 in 1 vaccination + deworm price around :RM 55 (first vaccination)
one month later u can go for 2nd vaccination (4 in 1 also) + deworm which is also RM55
this is the BASIC vaccination, u can go for premium coverage, but then that come with a higher price.

Neutering can be perform when the cat is around 5-6 months old (human time)
price is around (subjective to each vet)
male: 130-180
female: 180-250

No problem,
Yes, the flea is quite hard to spot, but once u get use to the cat, things will come handy.
Yep, Neutering is indeed expensive, but is worth the price, the cat will be alot calm (chances), accident free as they dont really fight much if his a he (chances), headache free from pregnancy if is a female (Thats for sure!).

Bottom line, neutering is a responsible, so please schedule that in ur list.

Well done to u, u have save a innocent soul.